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Benzoyl styrene 유도체에 대한 Thiourea 의 친핵성 첨가반응 메카니즘과 그 반응속도론적 연구
이기창,윤철훈,황성규,류정욱 ( Ki Chang Lee,Chul Hun Yoon,Sung Kwy Hwang,Jung Uk Ryu ) 한국유화학회 1995 한국응용과학기술학회지 Vol.12 No.2
Benzoyl styrene derivatives were synthesized by Claisen-Schmidt condensation. It was measured that nucleophilic addition of thiourea for benzoyl styrene made use of ultraviloet spectrophotometery at a wide pH 1.0~13.0 range in 5% dioxane-H_2O at 40℃. On the basis of general base catalysis, substitutent effect, and confirmation of addtion reaction product, the nucleophilic addtion kinetics of thiourea for benzoylstyrene derivatives were measured by pH change. It maybe concluded that a part was unrelated to pH and another part was in proportion to concentration of hydroxide ion : Above pH 10.0. It was in propotion to concentration of hyfroxide ion, a part having no concern with pH was added to the neutral thiourea molecule. From the results of measurement the reaction reat and there findings, nucleophilic addition of thiourea to benzoylstyrene derivative was proposed a fitting mechanism.
Furfurylidene acetophenone 유도체에 대한 Thiourea 의 친핵성 첨가반응 메카니즘과 그 반응속도론적 연구
이기창,목갑영,오세영,류정욱 ( Ki Chang lee,Gab Young Mok,Se Young Oh,Jung Wok Ryu ) 한국유화학회 1997 한국응용과학기술학회지 Vol.14 No.1
Furfurylidene acetophenone derivatives were synthesis, it was measured that nucleophilic addition made use of UV at a wide pH 1.0∼13.0 range in 30% dioxane-H_2O solution, 25℃. On the basis of general base catalysis, substitutent effect, confirmation of nucleophilic addition products, it was measured the reaction rate of furfurylidene acetophenone derivatives for the pH change. It may be concluded that a part was unrelated to pH and another part was in proportion to concentration of hydroxide ion : Above pH 10.0 sulfide anion adds to the double bond(Michael type addition), a part having no concern with pH, addition reaction to double bond is initiated by addition of neutral thiourea molecule. From the result of measurement the reaction rate, nucleophilic addition of furfurylidene acetophenone derivatives confirmed to the irreversible first order, Through measurement the substituent effect, It found that reaction rate was accelerated by electron attracting group. On the basis of these findings, nucleophilic addition of thiourea for the furfurylidene acetophenone derivative was proposed a fitting mechanisms.
2-Fluorenylidene chalcone 유도체에 대한 Thioglycolic acid 의 친핵성 첨가 반응에 관한 연구
이기창,이광일,황용현,류정욱,윤철훈 ( Ki Chang Lee,Kwang Il Lee,Yong Hyun Hwang,Jung Wook Ryu,Cheol Hun Yoon ) 한국유화학회 1996 한국응용과학기술학회지 Vol.13 No.1
Fluorenylidene chalcone derivatives were synthesized by condensation. The structure of these compounds were ascertained by means of UV melting point IR and ^1H-NMR spectra. The nucleophilic addition reaction kinetics of Thioglycolic acid to fluorenylidene chalcone was investigate by UV in 20% dioxane-H_2O at 25℃. The rate equation which were applied over a wide pH1.0~13.0 range. On the basis of general base catalysis and sonfirmation of addition reaction product, the nucleophilic addition reaction kinetics of thioglycolic acid to fluorenylidene chalcone were measured by the pH change. From the result of the above caption, a plausible nucleophilic addition reaction mechanism of thioglycolic acid to fluorenylidene chalcone was proposed. These compounds may be used as the starting materials for the preparation of the engineering plastics or the germicide.
1,1,1-TCE , CFC-113 대체세정제를 이용한 스크린인쇄 세정연구
이기창,윤철훈,황성규,오세영,이석우,류정욱 ( Ki Chang Lee,Cheol Hun Yoon,Sung Kwy Hwang,Se young Oh,Seok Woo Lee,Jung Wok Ryu ) 한국유화학회 1997 한국응용과학기술학회지 Vol.14 No.2
The field of printing use to pressurization ink using screen gassamer that is called screen printing. Existing cleaning solvent using screen printing are he organic solvents including aromatic compounds carried with poisonous and stench. Besides, cleaning method of current screen printing are for the most part mixed cleaning method of dipping and polish. Using 1,1,1-TEC, CFC-113 alternative system cleaning solvent be substituted for existing cleaning solvent against screen printing ink measured the cleaning efficiency according to gravimetric analysis method and property change of gassamer according to Image Analyzer. Also, Cleaning process system carry with excellent cleaning efficiency studied which was proposed new cleaning process including ultrasonic and vibration cleaning process be substituted for existing mixed cleaning method of dipping and polish.
1,3-Disubstituted Pyrido [2,3-d] Pyrimidinedione
류정욱,이기창,강삼룡 明知大學校 産業技術硏究所 1984 産業技術硏究所論文集 Vol.3 No.-
1,3-Disubstituted pyrido [2, 3-d] pyrimidine-2, 4-diones derivatives were synthesized by the following method A and B. Method A: 1-Substituted pyrido [2, 3,-d] pyrimidine-2, 4-diones were prepared by the reaction of 2-[N-substituted amino] nicotinic acid with urea at high temperature. On the other hand method B:1-Substituted pyrido [2, 3-d] pyrimidine-2 4-dione prepared by the reaction of 2-[N-substituted amino] nicotinamide with ethyl carbonate at low temperature. It was largely affected by catalyst and temperature that the synthesis of 2-[N-substituted amino] nicotinic acid as starting material, and amide of 2-[N-substituted amino] nicotinic and derivative was synthesized by the typical nucleophilic substitution of acyl halide. Considering the reaction time and temperature, however, it is clear that the method B is more efficient than the method A. The former requires only 2-3 hours of reaction time at 20-40℃, while the latter requires 7 hours at 180-200℃. Yields for two methods obtained were 60% all. Yields of 1, 3-disubstituted pyrido [2, 3-d] pyrimidine-2, 4-dione as object was obtained about 60% by the reaction of intermediate material with alkylated in the DMF solvent. It has been affirmed that the mechanism of reactions involved in synthesis was of nucleophilic substitution. The molecular structure, and molecular weight of 1, 3-disubstituted pyrido [2, 3-d] pyrimidine-2, 4-diones were confirmed by the analysis of physicochemical instrumentation such as IR, NMR, and Ms spectra, and the physical properties were examined.
이기창,류정욱 한국유화학회 1992 한국응용과학기술학회지 Vol.9 No.2
The kinetics of the hydrolysis of indolylacrylophenone derivatives(IA) was investigated by ultraviolet spectrophotometry in 30% dioxane-H_2O at 25℃. Rate equations were obtained over a wide pH range. On the basis of rate equation, general base catalysis and Hammett's plot, the mechanism of hydrolysis to the (IA) were proposed ; Below pH 3.0, the hydrolysis of (IA) was proportional to hydronium ion concentration, between pH 4.0~9.0 neutral water molecule and hydroxide ion were added to carbon-carbon double bond and over pH 10.0 hydrolysis of (IA) was proportional to hydroxide ion concentration.